It is reported that Yan, a hero, has no historical prototype, so he is a fictional character. Yan represents a patriotic spirit. The play tells the story that Song Yanqiao gradually grew into a heroic patriotic hero like Yan in the process of searching for Yan.

In the play, we can learn that Yan is a great hero who specializes in killing Japanese bad guys and some traitors. However, Yan's identity is not the * * * production party or the Kuomintang. He can be said to be a very mysterious figure.

At first, everyone thought that the hero Song Yanqiao was Yan. However, he was not. In the story that has been broadcast, we can see that Song Yanqiao has been looking for Yan to join the producer of * * * to fight against Japan together, but he has never found it.

Later, everyone thought that crazy Zhao was Yan. Zhao Madman is also a mysterious figure. Although he bravely helped Song Yanqiao, Song Yanqiao still doubted his identity, but he couldn't find who he was. At present, it has been revealed on the Internet that Zhao Crazy is an agent and has been expelled from the Party, so he should be a patriot, not Yan.

Some netizens broke the news that Yan appeared in the first episode, that is, a character named Ishikawa was driving around dohihara. When Gu's analysis was strict, Ishikawa showed a surprised expression on his face. Therefore, everyone guessed that he was Yan.